diff --git a/b_asic/resources.py b/b_asic/resources.py
index f2405bd92bb37d7cc86e1cddbd7ba47910b114a3..b81c71630377720d25c58f8aa34ad510f3513165 100644
--- a/b_asic/resources.py
+++ b/b_asic/resources.py
@@ -324,6 +324,11 @@ class _ForwardBackwardTable:
         return len(self.table)
 
     def __str__(self):
+        # ANSI escape codes for coloring in the forward-backward table stirng
+        GREEN_BACKGROUND_ANSI = "\u001b[42m"
+        BROWN_BACKGROUND_ANSI = "\u001b[43m"
+        RESET_BACKGROUND_ANSI = "\033[0m"
+
         # Text width of input and output column
         def lst_w(proc_lst):
             return reduce(lambda n, p: n + len(str(p)) + 1, proc_lst, 0)
@@ -362,9 +367,6 @@ class _ForwardBackwardTable:
             res += f'{inputs_str:^{input_col_w-1}}|'
 
             # Register columns
-            GREEN_BACKGROUND_ANSI = "\u001b[42m"
-            BROWN_BACKGROUND_ANSI = "\u001b[43m"
-            RESET_BACKGROUND_ANSI = "\033[0m"
             for reg_idx, reg in enumerate(entry.regs):
                 if reg is None:
                     res += " " * reg_col_w + "|"
diff --git a/test/test_resources.py b/test/test_resources.py
index 5b1a484e82d2d461261d5529fc0148a1818ca143..9575d85f6aebd390f48e18644ab28e214081429c 100644
--- a/test/test_resources.py
+++ b/test/test_resources.py
@@ -1,13 +1,15 @@
 import pickle
+import re
 
 import matplotlib.pyplot as plt
 import pytest
 
+from b_asic.process import PlainMemoryVariable
 from b_asic.research.interleaver import (
     generate_matrix_transposer,
     generate_random_interleaver,
 )
-from b_asic.resources import ProcessCollection
+from b_asic.resources import ProcessCollection, _ForwardBackwardTable
 
 
 class TestProcessCollectionPlainMemoryVariable:
@@ -83,6 +85,29 @@ class TestProcessCollectionPlainMemoryVariable:
             word_length=16,
         )
 
+    def test_forward_backward_table_to_string(self):
+        collection = ProcessCollection(
+            collection={
+                PlainMemoryVariable(0, 0, {0: 5}, name="PC0"),
+                PlainMemoryVariable(1, 0, {0: 4}, name="PC1"),
+                PlainMemoryVariable(2, 0, {0: 3}, name="PC2"),
+                PlainMemoryVariable(3, 0, {0: 6}, name="PC3"),
+                PlainMemoryVariable(4, 0, {0: 6}, name="PC4"),
+                PlainMemoryVariable(5, 0, {0: 5}, name="PC5"),
+            },
+            schedule_time=7,
+            cyclic=True,
+        )
+        t = _ForwardBackwardTable(collection)
+        process_names = {match.group(0) for match in re.finditer(r'PC[0-9]+', str(t))}
+        register_names = {match.group(0) for match in re.finditer(r'R[0-9]+', str(t))}
+        assert len(process_names) == 6  # 6 process in the collection
+        assert len(register_names) == 5  # 5 register required
+        for i, process in enumerate(sorted(process_names)):
+            assert process == f'PC{i}'
+        for i, register in enumerate(sorted(register_names)):
+            assert register == f'R{i}'
+
     # Issue: #175
     def test_interleaver_issue175(self):
         with open('test/fixtures/interleaver-two-port-issue175.p', 'rb') as f: